WO2003025609A1 - Magnet-resonanz-tomographiegerät mit lärmunterdrückung durch dämpfung von mechanischen schwingungen - Google Patents
Magnet-resonanz-tomographiegerät mit lärmunterdrückung durch dämpfung von mechanischen schwingungen Download PDFInfo
- Publication number
- WO2003025609A1 WO2003025609A1 PCT/DE2002/003204 DE0203204W WO03025609A1 WO 2003025609 A1 WO2003025609 A1 WO 2003025609A1 DE 0203204 W DE0203204 W DE 0203204W WO 03025609 A1 WO03025609 A1 WO 03025609A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tomography device
- gradient coil
- spin tomography
- damping elements
- vibrations
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/385—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils
- G01R33/3854—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using gradient magnetic field coils means for active and/or passive vibration damping or acoustical noise suppression in gradient magnet coil systems
Definitions
- the present invention relates generally to magnetic resonance imaging (synonym: magnetic resonance tomography - MRT) as it is used in medicine for examining patients.
- the present invention relates in particular to a nuclear spin tomography device in which
- Vibrations of device components which have a negative impact on the overall system in many aspects, are reduced.
- MRI is based on the physical phenomenon of nuclear magnetic resonance and has been used as an imaging method for over 15 years
- MRI as a sectional image method in medical diagnostics is primarily characterized as a "non-invasive" examination method characterized by a versatile contrast ability. Due to the excellent visualization of the soft tissue, MRI has developed into a procedure that is often superior to X-ray computed tomography (CT).
- CT computed tomography
- the MRI today is based on the application of spin echo and gradient echo sequences Measurement times in the range from seconds to minutes enable excellent image quality.
- FIG. It shows a superconducting basic field magnet 1 (e.g. an axial superconducting air coil magnet with active stray field shielding) which generates a homogeneous magnetic basic field in an interior.
- the superconducting basic field magnet 1 consists of coils that are located in liquid helium.
- the basic field magnet is surrounded by a double-shelled case 12, which is usually made of stainless steel.
- the inner boiler which contains the liquid helium and partly also serves as a winding body for the magnetic coils, is suspended from the outer boiler, which has room temperature, via weakly heat-conducting GRP rods (rods). There is a vacuum between the inner and outer boiler.
- the inner and outer boiler is called a magnetic vessel.
- the cylindrical gradient coil 2 is inserted concentrically into the interior of the basic field magnet 1 into the interior of a support tube by means of support elements 7.
- the support tube is delimited on the outside by an outer shell 8 and on the inside by an inner shell 9. The function of the shell 10 will be explained later.
- the gradient coil 2 has three partial windings which generate a gradient field which is proportional to the current impressed and is spatially perpendicular to one another.
- the gradient coil 2 comprises an x coil 3, a y coil 4 and a z coil 5, each of which is wound around the coil core 6 and thus expediently generates a gradient field in the direction of the Cartesian coordinates x, y and z.
- Each of these coils is equipped with its own power supply in order to generate independent current pulses according to the sequence programmed in the pulse sequence controller with precise amplitude and timing.
- the required currents are in the range up to about 250 A.
- the high-frequency coil (RF resonator or antenna) is located within the gradient coil. It has the task of converting the RF pulses emitted by a power transmitter into an alternating electromagnetic field to excite the atomic nuclei and then converting the alternating field emanating from the precessing nuclear moment into a voltage supplied to the receiving branch.
- the gradient coil is generally surrounded by conductive structures (e.g. stainless steel magnetic vessel), the pulsed fields cause eddy currents in them, which interact with the basic magnetic field to exert force on these structures and also stimulate them to vibrate.
- conductive structures e.g. stainless steel magnetic vessel
- the transmission of vibration energy between the gradient coil and the other components of the tomograph is counteracted by the use of mechanical and / or electromechanical vibration dampers.
- passive-acting rubber bearings are used, for example, or piezo actuators integrated into the gradient coil, which enable active countermeasures in controlled operation and thus reduce the oscillation amplitude of the gradient coil.
- Vibrations of the magnetic vessel are usually mechanically dampened by cushions in relation to the gradient coil. The following passive measures are usually also taken to reduce the vibrations:
- the path of noise generation via the inside of the MRI device i.e. Production of noise by vibration of the gradient coil and transmission of the noise to the support tube located in the gradient coil (8, 9, FIG. 2), which radiates it inwards to the patient and the interior, is, according to US Pat. No. 4,954,781, by a damping visco-elastic layer 10 (Figure 2) blocked in the double-layer interior of the support tube.
- the object of the present invention is therefore that
- a nuclear spin tomography device which has a magnetic body, surrounded by a magnetic shell which surrounds and delimits an interior, a gradient coil system being located in this interior.
- the damping elements according to the invention comprising a material which has negative rigidity.
- the material proposed for damping advantageously does not require any information about the deformation to be counteracted - in contrast to e.g. with active vibration suppression, especially with piezo actuators.
- the proposed material has a purely passive effect in that the corresponding material property and not a property of a technically implemented attenuator resulting from the construction is used.
- Another important advantage is the possibility of producing the proposed material in a form suitable in terms of space and mechanics. This allows the use of the material in highly integrated assemblies, such as in the gradient system. Since the damping works with the proposed material without additional control electronics, in contrast to active vibration suppression according to the prior art, a disturbance in the image generation process is excluded.
- damping elements are also advantageously arranged between cladding parts and the magnetic vessel and between the magnetic vessel and the floor for the absorption of acoustic vibrations.
- the damping elements advantageously consist of composite bearing materials.
- the bearing materials can have inclusions of negative rigidity.
- the material from which the damping elements are made is used in a further embodiment of the invention for damping the vibrations within the gradient coil itself.
- the embodiment of the damping elements can be formed by different geometric shapes. Plates, rings or ring segments are conceivable, etc.
- Figure 1 shows a schematic section through the basic field magnet and the components of the interior that it encloses.
- Figure 2 shows a perspective view of the basic field magnet.
- FIG. 3 shows a perspective illustration of the gradient coil with the three partial windings.
- FIG. 1 shows a schematic section through the basic field magnet 1 of an MRI device.
- the gradient coil 2 is located in the interior of the latter.
- FIG. 1 shows, by way of example, some covering parts 11 and the base 13 on which the MRI device is located.
- the basic field magnet 1 contains superconducting magnetic coils which are in liquid helium and is surrounded by a double-shelled boiler 12, also called a magnetic vessel.
- the system shown schematically in Figure 1 has the gradient coil 2 as a vibration source.
- the present invention makes it possible to reduce the transmission of noise by using special damping elements 14 at certain strategic locations.
- the strategic points are the interfaces between the gradient coil 2 and the magnet vessel 12 or between the magnet vessel 12 and the base 13 and between the magnet vessel 12 and the cladding parts 11.
- this material for damping the vibrations within the gradient coil 2 itself.
- the material is advantageously arranged in such a way that it is arranged at the location of the antinodes in order to reduce the oscillation amplitude.
- Negative stiffness means that a material reacts to a deforming force with a displacement in the opposite direction. This effect is different from the property of some compressible foams, when stretched in one
- a mechanical example of negative stiffness is a compressed spring, which is then used to apply pressure to another material in the direction of compression.
- the proposed damping is particularly well suited for use in MRI devices, particularly in gradients. tens coils and magnetic vessels. Their very high damping effect enables efficient suppression of mechanical vibrations and thus helps to suppress unwanted noise generation and transmission.
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- High Energy & Nuclear Physics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Radiology & Medical Imaging (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002459122A CA2459122A1 (en) | 2001-09-03 | 2002-08-30 | Nmr tomography machine with noise suppression by damping of mechanical vibrations |
KR10-2004-7003207A KR20040029149A (ko) | 2001-09-03 | 2002-08-30 | 기계 진동을 감쇠시킴으로써 소음을 억제하는 기능을 가진자기 공명 단층촬영 장치 |
JP2003529185A JP4214056B2 (ja) | 2001-09-03 | 2002-08-30 | 機械的振動の減衰により騒音を抑制する磁気共鳴断層撮影装置 |
EP02760140A EP1425597A1 (de) | 2001-09-03 | 2002-08-30 | Magnet-resonanz-tomographiegerät mit lärmunterdrückung durch dämpfung von mechanischen schwingungen |
US10/488,495 US6917200B2 (en) | 2001-09-03 | 2003-03-03 | Magnetic resonance tomography device having a noise-suppressing function by damping mechanical vibrations |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10143048A DE10143048C1 (de) | 2001-09-03 | 2001-09-03 | Magnet-Resonanz-Tomographiegerät mit Lärmunterdrückung durch Dämpfung von mechanischen Schwingungen |
DE10143048.5 | 2001-09-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003025609A1 true WO2003025609A1 (de) | 2003-03-27 |
Family
ID=7697500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/003204 WO2003025609A1 (de) | 2001-09-03 | 2002-08-30 | Magnet-resonanz-tomographiegerät mit lärmunterdrückung durch dämpfung von mechanischen schwingungen |
Country Status (7)
Country | Link |
---|---|
US (1) | US6917200B2 (de) |
EP (1) | EP1425597A1 (de) |
JP (1) | JP4214056B2 (de) |
KR (1) | KR20040029149A (de) |
CA (1) | CA2459122A1 (de) |
DE (1) | DE10143048C1 (de) |
WO (1) | WO2003025609A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7345559B2 (en) * | 2001-09-13 | 2008-03-18 | General Electric Company | High field open MRI magnet isolation system and method |
EP1815263A1 (de) * | 2004-11-17 | 2007-08-08 | Koninklijke Philips Electronics N.V. | Magnetresonanzsystem mit reduzierter lautstärke |
JP4878174B2 (ja) * | 2006-02-24 | 2012-02-15 | 株式会社日立製作所 | 磁気共鳴イメージング装置 |
US10221769B2 (en) | 2016-12-02 | 2019-03-05 | General Electric Company | System and apparatus for gas turbine combustor inner cap and extended resonating tubes |
US10228138B2 (en) | 2016-12-02 | 2019-03-12 | General Electric Company | System and apparatus for gas turbine combustor inner cap and resonating tubes |
US10220474B2 (en) | 2016-12-02 | 2019-03-05 | General Electricd Company | Method and apparatus for gas turbine combustor inner cap and high frequency acoustic dampers |
US11506382B2 (en) | 2019-09-12 | 2022-11-22 | General Electric Company | System and method for acoustic dampers with multiple volumes in a combustion chamber front panel |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19722481A1 (de) * | 1997-05-28 | 1998-12-03 | Siemens Ag | Kernspintomograph und Verwendung einer Geräuschminderungseinrichtung bei einem Kernspintomographen |
DE19802359A1 (de) * | 1998-01-22 | 1999-07-29 | Bschorr Oskar Dr | Elemente mit negativer Federkonstanten zur Schall- und Schwingungsbekämpfung |
DE19838390A1 (de) * | 1998-08-24 | 2000-03-02 | Siemens Ag | Lärmreduziertes diagnostisches Magnetresonanzgerät |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3410473C2 (de) * | 1983-04-11 | 1986-02-06 | Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln | Federungssystem für ein Kraftfahrzeug |
JPH0284935A (ja) * | 1988-06-14 | 1990-03-26 | Toshiba Corp | 磁気共鳴イメージング装置 |
US5178357A (en) * | 1989-08-16 | 1993-01-12 | Platus David L | Vibration isolation system |
US5793210A (en) * | 1996-08-13 | 1998-08-11 | General Electric Company | Low noise MRI scanner |
DE19940551C1 (de) * | 1999-08-26 | 2001-05-23 | Siemens Ag | Magnetresonanztomographiegerät mit schwingungsentkoppelter äußerer Hülle |
EP1348136B1 (de) * | 2000-12-05 | 2008-04-23 | Koninklijke Philips Electronics N.V. | Mri-apparat mit einer piezo-betätigungsvorrichtung in einer nicht starren aufhängung des gradienten-spulenträgers |
US7345559B2 (en) * | 2001-09-13 | 2008-03-18 | General Electric Company | High field open MRI magnet isolation system and method |
-
2001
- 2001-09-03 DE DE10143048A patent/DE10143048C1/de not_active Expired - Fee Related
-
2002
- 2002-08-30 KR KR10-2004-7003207A patent/KR20040029149A/ko not_active Application Discontinuation
- 2002-08-30 JP JP2003529185A patent/JP4214056B2/ja not_active Expired - Fee Related
- 2002-08-30 EP EP02760140A patent/EP1425597A1/de not_active Withdrawn
- 2002-08-30 CA CA002459122A patent/CA2459122A1/en not_active Abandoned
- 2002-08-30 WO PCT/DE2002/003204 patent/WO2003025609A1/de active Application Filing
-
2003
- 2003-03-03 US US10/488,495 patent/US6917200B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19722481A1 (de) * | 1997-05-28 | 1998-12-03 | Siemens Ag | Kernspintomograph und Verwendung einer Geräuschminderungseinrichtung bei einem Kernspintomographen |
DE19802359A1 (de) * | 1998-01-22 | 1999-07-29 | Bschorr Oskar Dr | Elemente mit negativer Federkonstanten zur Schall- und Schwingungsbekämpfung |
DE19838390A1 (de) * | 1998-08-24 | 2000-03-02 | Siemens Ag | Lärmreduziertes diagnostisches Magnetresonanzgerät |
Non-Patent Citations (2)
Title |
---|
LAKES R S ET AL: "Extreme damping in composite materials with negative-stiffness inclusions", NATURE, 29 MARCH 2001, NATURE PUBLISHING GROUP, UK, vol. 410, no. 6828, pages 565 - 567, XP002222504, ISSN: 0028-0836 * |
LAKES R S: "Extreme damping in composite materials with a negative stiffness phase", PHYS REV LETT;PHYSICAL REVIEW LETTERS MAR 26 2001, vol. 86, no. 13, 26 March 2001 (2001-03-26), pages 2897 - 2900, XP002222542 * |
Also Published As
Publication number | Publication date |
---|---|
KR20040029149A (ko) | 2004-04-03 |
US20040196041A1 (en) | 2004-10-07 |
JP2005521434A (ja) | 2005-07-21 |
US6917200B2 (en) | 2005-07-12 |
CA2459122A1 (en) | 2003-03-27 |
EP1425597A1 (de) | 2004-06-09 |
JP4214056B2 (ja) | 2009-01-28 |
DE10143048C1 (de) | 2003-04-17 |
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